Solenoid.



G. J. ANDERSON.

summon). APPLICATION FILED MAR. 16, 1909.

, Patented Jan, 30, 1912. V z-snms-snnm 1.

G. J. ANDERSON. SOLENOID. APPLICATION FILED MAR. 16, 1909.

Jaw/Maia? fi v m/ 627% r 1,015,925. Patented Jan. 30, 1912.

2 SHEETSSHEBT 2.

can: if ANDERSON, or omoaeo, ILLINOIS,-

ASSIGNOR T0 J. Ii. SCHUBIEMAN 00., OF

CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

SOLENOID.

Specification of Letters Patent. i

Application filed March 16, 1909. Serial No. 483,839.

' material is yieldingly supported in an opening in the pole-piece of the solenoid to cooperate with the core thereof for reducing vibrations of the latter and preventing it from striking the pole-piece, and thus prevent objectionable noise in the operation of the solenoid and undue wear of its parts.

Solenoids constructed in accordance with the above referred-to application present the objection, under some conditions, of holding the core in raised position in magnetic contact with the plug after the current is shut off, thereby preventing the core from resuming normal inoperative condition upon the discontinuance of the operation of the solenoid. My primary ob ect is to overcome this objection and to provide a construe tion of alternatin current solenoid which will insurethe separation of the core from the plug after the cessation of current through the solenoid.

Another object is to so construct the plug as to cause it to contactthroughout its lower surface with the top of the core under all conditions Referring to the drawings-I*igure 1 is a face view of a construction of electrical apparatus for cutting out resistances in a circuit to be supplied with current, showing the switches as operated by a solenoid embodying my invention. Fig. 2 is a section taken at the line 2 on Fig. 1' and viewed in the direction of the-arrow; Fig. 3 is a view in vertical longitudinal section of a plug and spring-supporting means thereforcon structed in accordance with my invention; and Fig. 4%, a view similarto that represented in Fig 3 of a modification of the construction therein shown.

I have chosen to illustrate my The plate 21 comprises a series of three-point switches 4: and 5 spaced apart and of the lever-type illustrated, each pivoted near its lower end on a bracket 6, as indicated at 7. The upper end-portion of each switch carries two spring-pressed contacts 8 and 9, which are slidably mounted therein to engage with opposed contacts 10 and 11, respectively, for the purpose of producing electrical connection with the latter and the switches.

In the operation of the apparatus illustrated, it is designed that the switches 4 and 5 be operated successively to successively cut out resistances in a circuit, not shown, to be supplied with current. The means for accomplishing this purpose comprise a shaft 12 journaled in bearings 13, 13 to extend between the switches and the supporting-plate 14 of the apparatus, with cams 15 fixed thereon, one oppositethe other, to extend into different positions on the shaft; and lever-mechanism connected with said Patented J an. 30, 1912.

switch-lever, as indicated at- 16, and consisting of a link 17 extending approximately vertical from the switch-arm, and a link 18 pivotally connected with the link '17 and carrying a roller 19 which bears against the shaft. 12 by reason of exertion of gravity upon the switch-arms, which tends to cause them to drop to the position illustrated in Fig. 2. 3

In the construction illustrated, the switches 4 and 5 are shown to be operated by a solenoid 20 embodying my invention, the construction of the solenoid as shown in the drawings 'being as follows: Confined between top and bottom plates, forming pole-pieces 21 and 22, respectively, fastened to the supporting-plate 14, as by bolts 28, is a coil 24- which surrounds a tube 25 preferably extending in the plates 21 and 22, as illustrated, and sliding in this tube is a core 26 of magnetic material provided on its lower end with a rack 27 engaging a gear-wheel 28 rigidly secured on the shaft 12 between the switches 4 and 5, the extreme lower end of the core 26 operating in a dash-pot 29, for the usual purpose.

approximating that of the tube 25 and concentric with the latter, and slidably confined in this opening to permit it to move up and down therein, is a member 31 inthe contains an opening 30* through it preferably of a diameter closely 4 form of a plug. The lug 31 comprises two sections 32 and 33, eac formed of magnetic material, such as soft iron. The section 32 is provided with a longitudinallyextending bore 34, and the section 33 contains a socket 35 of the same internal diameter" as the bore 34. The sections 32 and 33 are held together with a washer 36 of non-.

magnetic material, such as copper or any other suitable material interposed between them, by means of a pin 37, this pin extending loosely through the bore 34 and into the socket The lower end of the pin is connected with the section 33 through the medium of a pin 38 extending transversely through the section 33 and pin 37 the upper end of the pin 37 carrying a head 39 between the under side of which and the upper side of a partition 40 extending inwardly from a boss 41 between the ends of the latter carried by a plate 42 designed to be secured to the pole-piece 21 as by bolts 43, is a coiled spring 44, and confined between the upper surface of the section 32 and the under surface of the partition 40 is a similar coiled spring. 45, it being intended that the springs 44 and 45 be under tension when the parts are assembled in their relative positions described. The diameter of the section 32 is such as to cause-it to have a sliding fit in the opening in the pole-piece 21, and it is preferred that the section be of av diameter slightly less than the section The described parts are so constructed as I to cause the lower end of the plug 31 to extend normally a slight distance below the pole-piece 21 and into the path of the core 26, as illustrated in' Fig. 2.

When the current is directed through the solenoid-coil, it causes the core 26 to rise' with the result of turning the gear 28 and shaft 12, and with the latter the cams 15, which, as they successively" engage with the rollers 19 of the respective switch-lever mechanisms, cause the switch-arms-4 and 5 to be forced rearwardly into engagement with the respectivecontacts 10 and 11, it being the design in such constructions to maintain a circuit through the solenoid to hold its core in raised position so long as itis desired that the switches remain closed.

As soon as the core 26 moves into contact with the plug 31, the latter, under the magnetic influence of the solenoid, becomes attracted to the core and clings to it and this virtually becomes a part of it while thusvin contact and during the traverse of the current through the coil. The plug 31 by being yieldingly supported in the opening in the pole-piece is free to move up and down-therein and remains in magnetic contact with the core while the current is on and the latter vibrates under alternations of the current, the plug following the core without separating therefrom, thereby pre venting undue sinking of the core and objectionable noise in the operation of the solenoid. By forming the plug in sections as described, the core, when the current is shutoff, is caused to separate quickly from the section and descends to normally inoperatii'e positions, thus preventing the core from clinging to the plug an undue length of time after the current in the solenoid is shut off.

To effect the most desirable results in the operation of the coil, it is desirable that the lower end of the member 31 contact throughout its bottom surface with the top surface of the core. and as the latter may, under some conditions, not present its top surface at right-angles to its sides, either owing to defective workmanship or wear caused by impacts against it, I provide means for adjusting the section 33 upon the section to cause the lower surface of the section 33 to conform to the top surface of the core. This result is preferably accomplished by dishing the under side of the section 32 and convexing the upper side of the section 33, whereby the section 33 may be shifted automatically on the section 32 when the core strikes it, to the desired position of adjustment relative to the top of the core, in which position of adjustment it is held by frictional contact with the section 32 under the tension of the spring 45.

The construction illustrated in Fig. 4 represents another form in which the principal feature of my invention may be embodied.

In this construction, the sect-ions 32 and 33 v are connected together by a necleportion 46 formed integrally therewith, thereby afl'ording a space between them and rendering the sections out of complete magnetic contact, this construction operating, as described of the construction of the preceding figures, to cause the plug to follow the core inconstant contacttherewith during its vibrations under the action of the'alternatin'g current, but preventing the core from clinging to the plug after the flow of current through the coil has been shut off.

It will be noted that in the, case of both of the constructions illustrated, the sections 32 and 33 do not magnetically cont-act throughout their cross-sectional areas and thus they are not in complete magnetic con-- tact.

' The gist of my invention consisting in the forming of the plug in sections of magnetic material out of complete contact with each other, it is immaterial whether the sections be formed by connecting them integrally together, as for instance as exemplified in the construction represented in Fig. 4, or of con structing them of separable parts secured together, provided the plug be formed of solenoid of a particular construction,

magnetic sections out of complete magnetic contact, namely not in complete sectional contact with each other.,

While I have illustrated and described a feature of adjustment in connection wiIthda 0 not wish to he understood as limiting it to its application to such use, as it has utilityin its application to any form of solenoid in which the core cooperates with a movable member of magnetic material and, in fact, has application to any structure in which it I is desired to effect a complete magnetic contact between two devices.

What I claim as new, and desire to secure by Letters Patent, is

1. In a solenoid, in combination, a magnetic frame and windlng mounted therein, a relatively stationary core and a reciproeating core within said winding, said frame and said cores forming a magnetlc circuit, certain of said parts forming the magnetlc circuit being constructed to increase the magnetic reluctance.

2. In a solenoid, 1n comblnation, a magnetic frame and winding mounted therein, a

relatively stationary core and a reciprocating 'core within said winding, said frame and said cores forminga magnetic circuit andone of said parts included in the magnetic circuit, having portions thereof out of complete magnetic contact with one another, to. increase the reluctance thereof.

3. In a solenoid, in combination, a winding, a reciprocating core mounted therein, a plug within said winding arranged to be engaged by said core, said plug having portions out of complete magnetic contact with one another to insert a reluctance in the magnetic circuit therethrough.

4. In an alternating current solenoid, the combination with the sliding core, of a yielding'plug in the path of movement of said core, said plug being in sections formed of magnetic material, one of which is a coreengaging section, and the sections being out' of complete magnetic contact with each other.

' 5. In an alternating current solenoid, the

combination with the sliding core, of a normallyyieldingly supported plug in the path of movement of said core, said plug being in sectlons formed of magnetic material, one of -which is a core-engaging section, and the "sections being out of complete magnetic contact with each other.

6. In an alternating current solenoid, the

. combination with the sliding core, of a yield ing plug in the path of movement of said core, said plug being in sections formed of magnetic material, one of which is a coreengaging section of smaller volume than the other of said sections, and the sections being oukti of complete magnetic contact with each ot er.

7 In an alternating current solenoid, the combination with the sliding core, of a yielding plug in the path of movement of said core, said plug being in sect-ions formed of magnetic material, one of which is a coreengaging section of less volume and smaller diameter than the other of said sections, and the sections being out of complete magnetic contact with each other.

8. In an alternating current solenoid, the combination with the sliding core, of a yielding plug in the path of movement of said core, said plug being in sections formed of magnetic material connected together by a member fastened to one of said sections and extending through the other of said sections with non-magnetic material interposed between said sect-ions, for the purpose ,set forth. I

9. In an alternating current solenoid, the combination with the sliding core, of a yielding plug in the path of movement of said core, said plug being in sections formed of magnetic material connected together by a member fastened to one of said sections and extending through the otherof said sections, with non-magnetic material interposed between said sections, and means for holding the upper one of said sections in close engagement with the non-magnetic material.

10. In an alternating current solenoid, the combination with the sliding core, of a yielding plug in the path of movement of said core, said plug being in sections formed of magnetic material, thesections being out of complete magnetic contact with each other and the lower one of said sections being transversely adjustable with relation to its cooperating section, for the purpose set forth.

'11. In an alternating current solenoid, the combination with the sliding core, of a yielding plug in the path of movement of said core, said plug being in sections formed of magnetic material, the sections being out p of complete magnetic contact with each other and so connected together as to cause the lowermost one of said sections to be automatically shifted with relation to its cooperating section when the core impinges against it to cause the bottom surface of the lower section to flatwise impinge'against the top of the core, for the purpose set forth.

v 12. In an alternating current solenoid,the combination with the sliding core, of a yielding plug in the path of movement of said core, said plug being in sections formed of magnetic'material, a member connected with one of said sections and extending through the other of said sections with non magnetic material interposed between opposed ends of the'sections, said opposed ends of thesections being so shaped as to with relation to the other, for the purpose set forth.

13. In'an alternating current solenoid, the

combination with the sliding core, of a yielding plug in the path of movement of said core, said plug being in sections formed of magnetic material, a pin connected with the lower one of said sections and extending through the other of said sections, non-magnetic material interposed between opposed ends of said sections, and a spring operating to draw said sections together, the lower end of the upper section being dished and the upper end of the lower section being rounded, for the purpose set forth.

let. In an alternating current solenoid, the combination with the sliding core, of a resiliently supported plug in the path of movement of said core, said plug being in sections formed of magnetic material, one of which is a core-engaging section, and the.

sections being out of complete magnetic contact with each other.

15. In an alternating current solenoid, the combination with the sliding core, of a resiliently supported plug in the path of movement of said core, said plug being in sections formed of magnetic material, one of which is a core-engaging section of smaller volume than the other of said sections, and the sections being out of complete magnetic contact with each other.

16. In an alternating current solenoid, the combination with the sliding core, of a resiliently supported plug in the path of the other of said sections with non-magnetic material interposed between said sections, for the purpose forth.

18. In an alternating current solenoid, the combination with the sliding core, of a resiliently supported plug inthe path of movement of said core, said plug being in sections formed of magnetic 'material connected together by a member fastened to one of said sections and extending through the other of said sections, with non-magnetic material interposed between said sections, and means for holdingthe upper one of said sections in close engagement with the nonmagnetic material.

19. In combination, two members adapted in their operation to be moved into magnetic contact with each other, one of said members being formed in'sections one of which is'adjustable with relation to the other of said sections for producing flatwise abutmentof the contacting ends of said members, and means for moving said members into magnetic contact.

.20. In combination, two members adapted in their operation to be moved into magnetic contact with each other, one of said mem bers being formed in sections so constructed as to cause one of said sections to be auto-.

matically shiftable upon the other of said sections when thevmembers are brought together into contact for affording parallel impacting surfaces, and means for moving said members into magnetic contact, for the purpose set forth.

21. In a solenoid, in combination, a winding, a reciprocating core therein, and a plug within said winding arranged to be engaged by said core, said plug having an adjustable core-engaging portion for minimizing the air-space between the engaging parts of the core and plug when the same seal.

22. 'In a solenoid, in combination, a winding, a reciprocating core therein, and a plug within said winding arranged to be engaged by said core, said plug having a core-engaging portion connected thereto by a flexible joint to cause said core engaging portion to be automatically moved into a position in which its core-engaging face is parallel to the end of the reciprocating core when the latter is attracted thereto. 1

23. In an alternating-current solenoid, the combination with the coil, the pole-piece therefor containing an opening, and the sliding core, of a yieldingly-supported plug in the path of movement of said core, said plug being in sections formed of magnetic material, one of which is a core-engaging section, and the sections being out of complete magnetic contact with each other.

24. In an alternating-current solenoid, the combination with the coil, the polepiece therefor containing an opening, and the sliding core, of'a yieldingly-supported plug in the opening in the pole-piece extending into the path of movement of said core, a support on the pole-piece for the plug, said plug being in sections of magnetic material formed with a member carried by its lowermost section and extending through its other section with non-magnetic material interposed between said sections, and a spring operating against said support and said member for yieldingly supporting the plug in the opening in the pole-plece.

25. In a solenoid, in combination, a Wind;

ing, a reciprocating core therein, a plug.

within said winding arranged to be engaged by said core, said plug havlng a coreengaging portion connected thereto .by a v spring-tensioned flexible joint to cause said gaged by said core, and formed of two members movable relative to each other, one

by said core, D I

formed of magentic mater al, one of Sfllfl ing, a reciprocating core therein,

of which is 'a core-engaging member, a spring-tensloned rod extending through the plug and havmg connection with said core- -engaging member for forming a flexible joint between the latter and the other mem ber of the plug, forthe purpose set forth.

27. In a solenoid, in combination, a winding, a reciprocating core therein, a plug within said winding arranged to be engaged said plug being in sections sections being a core-engaging section, a member connected with one of said sections and extending through the other of said sections with non-magnetic material interposed between adjacent ends of the sections, said adjacent ends of'the sections being so shaped as to permit said coreengaging section to be automatically moved into a position in which its core-engaging face is parallel to the end of'the reciprocating core when the latter is attracted thereto. 28. In a solenoid, in combination, a winda plug within said Winding arranged to be engaged by said core, said plug being insections vformed of magnetic material, a pin connected with the lower one of said sections and extending through the other of said sections, and a spring operating to draw said sections together, the lower end of the upper section being dished, and the upper end of the lower section being rounded, for the purpose set forth.

29. In an alternating current solenoid, the

combination with a sliding core, of a plug in the path of movement of said core, said plug being in sections formed of magnetic 4 material, one of which is a core-engaging section, and the sections being outot' complete magnetic contact with each other, and means for yieldingly resisting the plug in its reciprocating movements in opposite (ii-- rections.

30. In an alternating current solenoid, the combination with a coil and a sliding core in the coil, of a plug in the path of movement of'the core, said plug being in sections formedvof magnetic material, one of which is a core-engaging section, and the sections being out of complete magnetic contact with each other, a relatively stationary support adjacent to the plug, and springs cooperae ing with said support and plug for centering the latter and rendering it yieldingly resistantto movement of the plug in oppo site directions. 31. in an alternating current SOlBIlOld, the combination with a COll and. a sliding core in the coil, of a plug in the path ofmovement of the core, said plug being in sections formedof magneticm'aterial, one

of which is a core-engaging section, and'thc sections being out of complete magnet c contact wit-beach other, a relatit ely stationary support adjacent to the plug',"and springs encircling said plug on opposite sides of said support with which latter said springs cooperate for centering the plug and'ren:

dering it yieldingly resistant to movement of the plug in opposite directions. 1

' CARL J. ANDERSON. In presence of- J W. B. Davms, R. A. SGHAEFER. 

